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Method for increase production of aromatic hydrocarbon raw material by use of inferior heavy aromatics

A technology for heavy aromatic hydrocarbons and heavy aromatic hydrocarbons, which is applied in the fields of high-purity benzene, C9 monocyclic aromatic hydrocarbons and C10 monocyclic aromatic hydrocarbon mixtures, xylene, and toluene, can solve the problem of low purity of aromatic hydrocarbon products and utilization rate of inferior heavy aromatic hydrocarbon raw materials. Problems such as low yield and low yield of monocyclic aromatic hydrocarbons

Active Publication Date: 2015-11-25
CHINA PETROLEUM & CHEM CORP +1
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The technical problem to be solved by the present invention is the low utilization rate of low-quality heavy aromatics raw materials, low single-ring aromatics yield, low purity of aromatics products, etc., and provides a new method for directly producing aromatics raw materials from low-quality heavy aromatics

Method used

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  • Method for increase production of aromatic hydrocarbon raw material by use of inferior heavy aromatics
  • Method for increase production of aromatic hydrocarbon raw material by use of inferior heavy aromatics
  • Method for increase production of aromatic hydrocarbon raw material by use of inferior heavy aromatics

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Experimental program
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Effect test

Embodiment 1

[0016] After mixing inferior heavy aromatics with a boiling point of 180-370°C and 6.0 MPa hydrogen, they enter the hydrotreating reactor to remove sulfur and nitrogen, and saturate part of the condensed ring aromatics until one aromatic ring remains. Table 1 lists the catalysts used and Reaction conditions. Table 2 lists the sulfur and nitrogen content, density, aromatic compound content, tetralin aromatic hydrocarbon content, and fraction distribution of raw materials and hydrorefined products. The nitrogen content of the hydrorefined product is less than 20 ppm.

[0017] Table 1

[0018]

[0019] Table 2

[0020]

[0021]

Embodiment 2

[0023] After the hydrorefined product is mixed with 6.0MPa hydrogen, it enters the selective hydrocracking reactor, where the selective hydrogenation ring-opening reaction and dealkylation reaction of tetrahydronaphthalene aromatics and polycyclic aromatics occur. Table 3 lists the catalysts and reaction conditions used. Selective hydrocracking reaction products are cut into light fractions below 70°C, light aromatic fractions at 70-145°C, heavy aromatic fractions at 145-200°C and heavy fractions greater than 200°C in series fractionation towers. The light fraction below 70°C is discharged to the outside; 70% of the heavy fraction is recycled to the selective hydrocracking reactor, and 30% of the heavy fraction is discharged to the outside; the 70-145°C light aromatic fraction is discharged as a product; the 145-200°C fraction sent downstream. Table 4 lists the composition of light aromatic components, mainly benzene, toluene, ethylbenzene and xylene, and also contains a smal...

Embodiment 3

[0030] After mixing the heavy aromatics fraction at 145-200°C with 3.0MPa hydrogen, it enters the heavy aromatics lightening reactor, where C9 aromatics, C10 and above aromatics undergo alkylation transfer and side chain dealkylation reactions. Table 5 lists the heavy aromatics lightening catalysts and reaction conditions used. The lightened products of heavy aromatics are returned to the fractionation system after oil and gas separation.

[0031] table 5

[0032]

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Abstract

The present invention relates to a method for increase production of an aromatic hydrocarbon raw material by use of inferior heavy aromatics, and mainly solves the problem that in the prior art inferior heavy aromatics containing condensed ring aromatic hydrocarbons cannot be used for increase production of a monocylic aromatic hydrocarbon raw material. The method comprises the following steps: a) sulfur and nitrogen impurities in an inferior heavy aromatic raw material rich in mixed condensed ring aromatic hydrocarbons are removed; b) selective hydrocracking reaction of the condensed ring aromatic hydrocarbons is performed; c) light fractions, light aromatic fractions, heavy aromatic fractions and heavy fractions are obtained by oil and gas separation, and fractionation in a fractionation system according to boiling points of the selective hydrocracking reaction product; d) heavy aromatic fractions and hydrogen are mixed, and enter into a heavy aromatic lightening reactor for occurrence of transalkylation and dealkylation reaction, and the reaction product is returned to the fractionation system; and e) the light aromatic fractions are discharged to the outside world as a product, by the technical scheme, the problem is well solved, and the method can be used in the industrial production for production of benzene, toluene and xylene.

Description

technical field [0001] The invention relates to a method for directly producing aromatic hydrocarbon raw materials from inferior heavy aromatic hydrocarbons, in particular to a method capable of catalytically converting a mixture containing condensed ring hydrocarbons into high-purity benzene, toluene, xylene, carbon nine monocyclic aromatic hydrocarbons and carbon ten monocyclic aromatic hydrocarbons Aromatic mixture method. Background technique [0002] Benzene and p-xylene (PX) are important basic organic chemical raw materials, which are widely used in the production of polyester, chemical fiber and other products. They are closely related to the development of the national economy and people's basic necessities of life. The demand has been strong and increasing rapidly in recent years. There are two main process routes for the source of aromatics raw materials: one raw material route is to obtain aromatics raw materials through catalytic reforming of naphtha and extract...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C15/04C07C15/06C07C15/073C07C15/08C07C7/163C07C4/06
Inventor 孔德金郑均林姜向东陈燕宋奇
Owner CHINA PETROLEUM & CHEM CORP
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